Firstly you dont say what your system is so the question 'will I need to update' is unanswerable. A year old laptop would probably do as long as its not a netbook. Laptops gernally have on board sound, which is basic but nowadays adequate. You could get an external sound card later if you need one. Most gear these days passes the 'passable' test for sound.
Biab is great for a novice its really easy to use. JUst select a song and away you go - two clicks. If you want you can turn of the other instruments and just leave drums with every track. Yes you can use it on a lap top but if you want to have the sound equalling an acoustic Piano you will need to plug the laptop sound into a hifi or other sound box - unless it has real volume.
You could start with the basic set up but make sure you get 'realtracks' they are much better than MIDI stuff and have more feel. The Everything package is on special until 31st I believe. I have just taken the leap myself and dont regret it.

You can go deeper, its easy to put in your own chords, and you can even create your own backing tracks to a degree -I find little need though.

I think that if you use it, you will want as many real tracks as you can get.

BIAB is going to be the best drum machine you will ever find.

Win 11 64, Asus Rog Strix z390 mobo, 64 gig RAM, 8700k